The scheme was developed in the wake of last year's Pestminster scandal and has been led by Commons leader Andrea Leadsom.

The new rules would mean that MPs who pay for sex while doing any activity related to their duties would face disciplinary action - and could see them have to resign their seats, the Sunday Times reported.

The new rules said: "although it might not be illegal pay for sex, in line with best practice it is considered unprofessional, inappropriate and a breach of the behaviour code."